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bpf, bpftool: fix a few ubsan warnings

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The issue is reported at https://github.com/libbpf/libbpf/issues/28.

Basically, per C standard, for
  void *memcpy(void *dest, const void *src, size_t n)
if "dest" or "src" is NULL, regardless of whether "n" is 0 or not,
the result of memcpy is undefined. clang ubsan reported three such
instances in bpf.c with the following pattern:
  memcpy(dest, 0, 0).

Although in practice, no known compiler will cause issues when
copy size is 0. Let us still fix the issue to silence ubsan
warnings.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Yonghong Song 2019-04-09 17:37:41 -07:00 committed by Daniel Borkmann
parent 6316f78306
commit 69a0f9ecef
1 changed files with 9 additions and 10 deletions
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19
tools/lib/bpf/bpf.c
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@ -79,7 +79,6 @@ static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size)
int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr) int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
{ {
__u32 name_len = create_attr->name ? strlen(create_attr->name) : 0;
union bpf_attr attr; union bpf_attr attr;
memset(&attr, '\0', sizeof(attr)); memset(&attr, '\0', sizeof(attr));
@ -89,8 +88,9 @@ int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
attr.value_size = create_attr->value_size; attr.value_size = create_attr->value_size;
attr.max_entries = create_attr->max_entries; attr.max_entries = create_attr->max_entries;
attr.map_flags = create_attr->map_flags; attr.map_flags = create_attr->map_flags;
memcpy(attr.map_name, create_attr->name, if (create_attr->name)
min(name_len, BPF_OBJ_NAME_LEN - 1)); memcpy(attr.map_name, create_attr->name,
min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1));
attr.numa_node = create_attr->numa_node; attr.numa_node = create_attr->numa_node;
attr.btf_fd = create_attr->btf_fd; attr.btf_fd = create_attr->btf_fd;
attr.btf_key_type_id = create_attr->btf_key_type_id; attr.btf_key_type_id = create_attr->btf_key_type_id;
@ -155,7 +155,6 @@ int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name,
int key_size, int inner_map_fd, int max_entries, int key_size, int inner_map_fd, int max_entries,
__u32 map_flags, int node) __u32 map_flags, int node)
{ {
__u32 name_len = name ? strlen(name) : 0;
union bpf_attr attr; union bpf_attr attr;
memset(&attr, '\0', sizeof(attr)); memset(&attr, '\0', sizeof(attr));
@ -166,7 +165,9 @@ int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name,
attr.inner_map_fd = inner_map_fd; attr.inner_map_fd = inner_map_fd;
attr.max_entries = max_entries; attr.max_entries = max_entries;
attr.map_flags = map_flags; attr.map_flags = map_flags;
memcpy(attr.map_name, name, min(name_len, BPF_OBJ_NAME_LEN - 1)); if (name)
memcpy(attr.map_name, name,
min(strlen(name), BPF_OBJ_NAME_LEN - 1));
if (node >= 0) { if (node >= 0) {
attr.map_flags |= BPF_F_NUMA_NODE; attr.map_flags |= BPF_F_NUMA_NODE;
@ -216,7 +217,6 @@ int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
void *finfo = NULL, *linfo = NULL; void *finfo = NULL, *linfo = NULL;
union bpf_attr attr; union bpf_attr attr;
__u32 log_level; __u32 log_level;
__u32 name_len;
int fd; int fd;
if (!load_attr || !log_buf != !log_buf_sz) if (!load_attr || !log_buf != !log_buf_sz)
@ -226,8 +226,6 @@ int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
if (log_level > (4 | 2 | 1) || (log_level && !log_buf)) if (log_level > (4 | 2 | 1) || (log_level && !log_buf))
return -EINVAL; return -EINVAL;
name_len = load_attr->name ? strlen(load_attr->name) : 0;
memset(&attr, 0, sizeof(attr)); memset(&attr, 0, sizeof(attr));
attr.prog_type = load_attr->prog_type; attr.prog_type = load_attr->prog_type;
attr.expected_attach_type = load_attr->expected_attach_type; attr.expected_attach_type = load_attr->expected_attach_type;
@ -253,8 +251,9 @@ int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
attr.line_info_rec_size = load_attr->line_info_rec_size; attr.line_info_rec_size = load_attr->line_info_rec_size;
attr.line_info_cnt = load_attr->line_info_cnt; attr.line_info_cnt = load_attr->line_info_cnt;
attr.line_info = ptr_to_u64(load_attr->line_info); attr.line_info = ptr_to_u64(load_attr->line_info);
memcpy(attr.prog_name, load_attr->name, if (load_attr->name)
min(name_len, BPF_OBJ_NAME_LEN - 1)); memcpy(attr.prog_name, load_attr->name,
min(strlen(load_attr->name), BPF_OBJ_NAME_LEN - 1));
fd = sys_bpf_prog_load(&attr, sizeof(attr)); fd = sys_bpf_prog_load(&attr, sizeof(attr));
if (fd >= 0) if (fd >= 0)